Vidit is trying to capitalize on the awkward-looking queen. 8...g6 is another, more solid idea.
6. b5d3  6... d4f3  7. d1f3  7... d7d6  8. d3e2 A somewhat unusual situation has arisen. We do not often see the queen in front of the minor pieces, except for in the Caro-Kann, perhaps.